{"gene":"RPS27","run_date":"2026-04-28T20:42:06","timeline":{"discoveries":[{"year":1976,"finding":"RPS27 (S27) was isolated as a component of the rat liver 40S ribosomal subunit; its molecular weight was estimated by polyacrylamide gel electrophoresis in SDS, and amino acid composition was determined, establishing it as a bona fide small-subunit ribosomal protein.","method":"Ion-exchange chromatography (carboxymethylcellulose), gel filtration (Sephadex G-75), SDS-PAGE, amino acid composition analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct biochemical purification and characterization of the protein from ribosomes","pmids":["947902"],"is_preprint":false},{"year":1993,"finding":"Rat ribosomal protein S27 contains 83 amino acids (MW 9,339 Da) and harbors a zinc finger-like motif, suggesting a structural role involving metal coordination; 4–6 gene copies were detected in the genome and the mRNA is ~620 nucleotides long.","method":"cDNA cloning and sequencing, amino acid sequencing of purified protein, Southern hybridization for gene copy number","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 — primary structure determined by orthogonal cDNA and protein sequencing with structural motif identification","pmids":["8441676"],"is_preprint":false},{"year":1995,"finding":"Mammalian RPS27 is characterized by a zinc finger domain among its structural motifs; the protein is conserved across eukaryotes and its mRNA contains features typical of ribosomal protein transcripts (5' TOP element).","method":"Comparative sequence analysis of 75 rat ribosomal proteins, identification of conserved motifs","journal":"Biochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 3 — comparative/structural analysis without direct functional mutagenesis","pmids":["8722009"],"is_preprint":false},{"year":2010,"finding":"Human RPS27 binds to MDM2 via its N-terminal region, interacting with the central acidic domain of MDM2; RPS27 forms an in vivo triplex complex with MDM2 and p53, competing with p53 for MDM2 binding. Ectopic RPS27 expression inhibits MDM2-mediated p53 ubiquitination and increases p53 protein levels by extending its half-life.","method":"Co-immunoprecipitation, domain mapping, ubiquitination assays, pulse-chase (half-life measurement), siRNA knockdown, ectopic expression","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with domain mapping plus functional ubiquitination and half-life assays in multiple cell contexts","pmids":["21170087"],"is_preprint":false},{"year":2010,"finding":"Unlike RPS27L, RPS27 is a p53-repressible (not inducible) target gene; RPS27 protein is not a substrate of MDM2 (in contrast to RPS27L) and is not short-lived, indicating divergent regulation despite shared MDM2-binding capacity.","method":"Promoter-reporter assays, immunoblot after p53 activation, protein stability assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — direct experimental comparison with functional controls in the same study","pmids":["21170087"],"is_preprint":false},{"year":2013,"finding":"Cryo-EM structures of the human 80S ribosome placed RPS27 within the small (40S) ribosomal subunit, revealing its position and contribution to the metazoan-specific structural layers of the ribosome.","method":"High-resolution cryo-electron microscopy","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — cryo-EM structural determination of the intact human ribosome at high resolution","pmids":["23636399"],"is_preprint":false},{"year":2014,"finding":"A frameshift deletion in RPS27 was identified in a Diamond-Blackfan anaemia (DBA) patient; in vitro knockdown of RPS27 disturbed pre-ribosomal RNA processing, and a zebrafish rps27 morpholino model showed impaired erythrocyte production and developmental defects, establishing RPS27 haploinsufficiency as causative for DBA through ribosome biogenesis failure.","method":"Whole-exome sequencing, in vitro siRNA knockdown with pre-rRNA processing analysis (Northern/qRT-PCR), zebrafish morpholino knockdown with erythrocyte staining","journal":"British journal of haematology","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function in two independent model systems (human cells + zebrafish) with defined molecular (rRNA processing) and cellular (erythropoiesis) phenotypes","pmids":["25424902"],"is_preprint":false},{"year":2014,"finding":"A recurrent somatic hotspot mutation in the 5' UTR of RPS27 was identified in ~10% of melanoma samples; the mutation expands the 5' terminal oligopyrimidine (5'TOP) element, a motif that regulates expression of ribosomal protein mRNAs in response to growth signals, potentially sensitizing RPS27 transcript abundance to mitogenic regulation.","method":"Collation of exome sequencing datasets from independent melanoma cohorts, 5'TOP motif analysis","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 — genomic discovery with mechanistic inference from known 5'TOP biology; no direct functional reconstitution of the regulatory effect","pmids":["24913145"],"is_preprint":false},{"year":2019,"finding":"Shrimp (Marsupenaeus japonicus) RPS27 (MjRPS27) activates the NF-κB pathway (promoting nuclear translocation of Dorsal and Relish and expression of antimicrobial peptides) in response to white spot syndrome virus (WSSV) infection; MjRPS27 also directly interacts with WSSV envelope proteins VP19, VP24, and VP28, inhibiting virion assembly. Knockdown increased viral replication; overexpression reduced it.","method":"RNA interference knockdown, overexpression, co-immunoprecipitation (RPS27 with viral envelope proteins), nuclear translocation assays, survival assay in vivo","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP plus gain- and loss-of-function in vivo with defined pathway (NF-κB) and molecular (virion assembly) readouts; invertebrate ortholog","pmids":["31921103"],"is_preprint":false}],"current_model":"RPS27 is an 83-amino-acid zinc-finger-containing protein of the 40S ribosomal subunit whose primary structural role in translation is established by purification and cryo-EM; extraribosomally, RPS27 binds the central acidic domain of MDM2, competes with p53 for MDM2 binding, inhibits MDM2-mediated p53 ubiquitination and thereby stabilizes p53, while itself being a p53-repressible (not inducible) gene and not a MDM2 substrate; loss-of-function mutations in RPS27 disrupt pre-rRNA processing and cause Diamond-Blackfan anaemia with erythropoietic failure, and recurrent 5'UTR mutations expanding the 5'TOP element are found in melanoma."},"narrative":{"teleology":[{"year":1976,"claim":"Establishing RPS27 as a bona fide 40S ribosomal subunit protein resolved its identity among the dozens of small-subunit components and provided the first biochemical characterization.","evidence":"Ion-exchange chromatography, gel filtration, SDS-PAGE, and amino acid composition analysis of rat liver 40S ribosomes","pmids":["947902"],"confidence":"High","gaps":["No primary sequence or gene structure available","No functional role beyond structural membership inferred"]},{"year":1993,"claim":"Determination of the full 83-amino-acid sequence revealed a zinc-finger-like motif, suggesting RPS27 has a metal-coordinating structural element unusual among ribosomal proteins, and the presence of a 5'TOP element placed its mRNA under growth-dependent translational control.","evidence":"cDNA cloning/sequencing, protein sequencing, and Southern blot of rat RPS27","pmids":["8441676"],"confidence":"High","gaps":["No direct evidence that the zinc finger is functionally required","No mutagenesis of the 5'TOP element to confirm translational regulation"]},{"year":2010,"claim":"Identifying RPS27 as a direct MDM2 interactor that stabilizes p53 by blocking MDM2-mediated ubiquitination established an extraribosomal tumor-suppressive function and connected ribosomal stress sensing to the p53 pathway.","evidence":"Co-immunoprecipitation with domain mapping, ubiquitination assays, pulse-chase half-life experiments, and siRNA/ectopic expression in human cell lines","pmids":["21170087"],"confidence":"High","gaps":["No in vivo demonstration of the MDM2–RPS27 axis in tumorigenesis","Crystal structure of the RPS27–MDM2 interface not resolved","Quantitative stoichiometry of free versus ribosome-bound RPS27 unknown"]},{"year":2013,"claim":"Cryo-EM placement of RPS27 within the human 80S ribosome provided the first structural context for its position in the small subunit and its contribution to metazoan-specific ribosomal architecture.","evidence":"High-resolution cryo-EM of the human 80S ribosome","pmids":["23636399"],"confidence":"High","gaps":["Atomic-resolution contacts of RPS27 with rRNA and neighboring proteins not fully detailed","Role in translational fidelity or decoding not addressed"]},{"year":2014,"claim":"Identification of a causative RPS27 frameshift in Diamond–Blackfan anaemia, supported by pre-rRNA processing defects in knockdown cells and erythropoietic failure in zebrafish, established RPS27 haploinsufficiency as a ribosomopathy mechanism.","evidence":"Whole-exome sequencing of DBA patients, siRNA knockdown with Northern blot/qRT-PCR for pre-rRNA intermediates, zebrafish morpholino with erythrocyte staining","pmids":["25424902"],"confidence":"High","gaps":["Precise step(s) in pre-rRNA processing that require RPS27 not delineated","Whether p53 pathway activation mediates the erythroid-selective phenotype not tested in this model"]},{"year":2014,"claim":"Discovery of recurrent somatic 5'UTR hotspot mutations extending the 5'TOP element in ~10% of melanomas suggested that altered translational control of RPS27 abundance contributes to oncogenesis, though direct functional proof was lacking.","evidence":"Collation of independent melanoma exome sequencing datasets with 5'TOP motif analysis","pmids":["24913145"],"confidence":"Medium","gaps":["No reporter or ribosome profiling assay demonstrating altered translational output from the mutant 5'TOP","Downstream consequence on ribosome stoichiometry or p53 regulation not tested","Single genomic discovery without functional reconstitution"]},{"year":null,"claim":"Key unresolved questions include: (1) the structural basis of the RPS27–MDM2 interaction at atomic resolution, (2) whether the zinc-finger motif has a specific rRNA-binding or extraribosomal function, (3) the precise step in pre-rRNA processing that depends on RPS27, and (4) the functional impact of melanoma 5'UTR mutations on RPS27 translation and p53 signaling.","evidence":"","pmids":[],"confidence":"High","gaps":["Atomic-resolution structure of RPS27–MDM2 complex","Zinc-finger mutagenesis studies","Mechanistic link between 5'UTR mutations and melanoma biology"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,5]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,4]}],"localization":[{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[0,1,5]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,5,6]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3,4]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[6,7]}],"complexes":["40S ribosomal subunit","80S ribosome"],"partners":["MDM2","TP53"],"other_free_text":[]},"mechanistic_narrative":"RPS27 (eS27) is a zinc-finger-containing structural component of the eukaryotic 40S ribosomal subunit that participates in both canonical translation and extraribosomal regulation of the p53–MDM2 axis. The 83-amino-acid protein was purified from mammalian ribosomes, shown to harbor a zinc-finger motif, and positioned within the metazoan small subunit by cryo-EM [PMID:947902, PMID:8441676, PMID:23636399]. Extraribosomally, RPS27 binds the central acidic domain of MDM2, competes with p53 for MDM2 binding, and inhibits MDM2-mediated p53 ubiquitination, thereby stabilizing p53, while itself being a p53-repressible (not p53-inducible) gene that is not a substrate of MDM2 [PMID:21170087]. Loss-of-function mutations in RPS27 impair pre-rRNA processing and cause Diamond–Blackfan anaemia through defective ribosome biogenesis and erythropoietic failure [PMID:25424902]."},"prefetch_data":{"uniprot":{"accession":"P42677","full_name":"Small ribosomal subunit protein eS27","aliases":["40S ribosomal protein S27","Metallopan-stimulin 1","MPS-1"],"length_aa":84,"mass_kda":9.5,"function":"Component of the small ribosomal subunit (PubMed:23636399, PubMed:8706699). The ribosome is a large ribonucleoprotein complex responsible for the synthesis of proteins in the cell (PubMed:23636399). Required for proper rRNA processing and maturation of 18S rRNAs (PubMed:25424902). Part of the small subunit (SSU) processome, first precursor of the small eukaryotic ribosomal subunit. During the assembly of the SSU processome in the nucleolus, many ribosome biogenesis factors, an RNA chaperone and ribosomal proteins associate with the nascent pre-rRNA and work in concert to generate RNA folding, modifications, rearrangements and cleavage as well as targeted degradation of pre-ribosomal RNA by the RNA exosome (PubMed:34516797)","subcellular_location":"Cytoplasm; Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/P42677/entry"},"depmap":{"release":"DepMap","has_data":false,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RPS27"},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"RBM8A","stoichiometry":4.0},{"gene":"RPL5","stoichiometry":4.0},{"gene":"SRP72","stoichiometry":4.0},{"gene":"ATG13","stoichiometry":0.2},{"gene":"CALM3","stoichiometry":0.2},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"DRG1","stoichiometry":0.2},{"gene":"NCAPH","stoichiometry":0.2},{"gene":"RBM42","stoichiometry":0.2},{"gene":"SRP19","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/RPS27","total_profiled":1310},"omim":[{"mim_id":"619447","title":"FAMILY WITH SEQUENCE SIMILARITY 189, MEMBER B; FAM189B","url":"https://www.omim.org/entry/619447"},{"mim_id":"617409","title":"DIAMOND-BLACKFAN ANEMIA 17; DBA17","url":"https://www.omim.org/entry/617409"},{"mim_id":"617408","title":"DIAMOND-BLACKFAN ANEMIA 16; DBA16","url":"https://www.omim.org/entry/617408"},{"mim_id":"612055","title":"RIBOSOMAL PROTEIN S27-LIKE; RPS27L","url":"https://www.omim.org/entry/612055"},{"mim_id":"607526","title":"RIBOSOMAL PROTEIN L27; RPL27","url":"https://www.omim.org/entry/607526"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Endoplasmic reticulum","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Nucleoli","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RPS27"},"hgnc":{"alias_symbol":["MPS-1","MPS1","S27","eS27"],"prev_symbol":[]},"alphafold":{"accession":"P42677","domains":[{"cath_id":"2.20.25.100","chopping":"28-80","consensus_level":"high","plddt":94.4079,"start":28,"end":80}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P42677","model_url":"https://alphafold.ebi.ac.uk/files/AF-P42677-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P42677-F1-predicted_aligned_error_v6.png","plddt_mean":92.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RPS27","jax_strain_url":"https://www.jax.org/strain/search?query=RPS27"},"sequence":{"accession":"P42677","fasta_url":"https://rest.uniprot.org/uniprotkb/P42677.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P42677/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P42677"}},"corpus_meta":[{"pmid":"20624901","id":"PMC_20624901","title":"Dissecting the role of MPS1 in chromosome biorientation and the spindle checkpoint through the small molecule inhibitor reversine.","date":"2010","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/20624901","citation_count":453,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"8567717","id":"PMC_8567717","title":"The Saccharomyces cerevisiae spindle pole body duplication gene MPS1 is part of a mitotic checkpoint.","date":"1996","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/8567717","citation_count":367,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"9770551","id":"PMC_9770551","title":"Inactivation of the mitogen-activated protein kinase Mps1 from the rice blast fungus prevents penetration of host cells but allows activation of plant defense responses.","date":"1998","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/9770551","citation_count":347,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22521787","id":"PMC_22521787","title":"Phosphoregulation of Spc105 by Mps1 and PP1 regulates Bub1 localization to kinetochores.","date":"2012","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/22521787","citation_count":298,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"22660415","id":"PMC_22660415","title":"MPS1/Mph1 phosphorylates the kinetochore protein KNL1/Spc7 to recruit SAC components.","date":"2012","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/22660415","citation_count":291,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"11461704","id":"PMC_11461704","title":"Mps1 is a kinetochore-associated kinase essential for the vertebrate mitotic checkpoint.","date":"2001","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/11461704","citation_count":281,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"18243099","id":"PMC_18243099","title":"Mps1 phosphorylates Borealin to control Aurora B activity and chromosome alignment.","date":"2008","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/18243099","citation_count":241,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"11927556","id":"PMC_11927556","title":"Human Mps1 kinase is required for the spindle assembly checkpoint but not for centrosome duplication.","date":"2002","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/11927556","citation_count":208,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"20383151","id":"PMC_20383151","title":"Small-molecule kinase inhibitors provide insight into Mps1 cell cycle function.","date":"2010","source":"Nature chemical biology","url":"https://pubmed.ncbi.nlm.nih.gov/20383151","citation_count":190,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"26068855","id":"PMC_26068855","title":"CELL DIVISION CYCLE. 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RPS27 competes with p53 for MDM2 binding, inhibits MDM2-mediated p53 ubiquitination, and increases p53 levels by extending p53 protein half-life when ectopically expressed.\",\n      \"method\": \"Co-immunoprecipitation, MDM2-binding domain mapping, p53 ubiquitination assay, pulse-chase half-life assay, siRNA knockdown\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, functional ubiquitination assay, and half-life measurement in a single study with multiple orthogonal methods\",\n      \"pmids\": [\"21170087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Rat ribosomal protein S27 (83 amino acids, MW 9,339) contains a zinc finger-like motif, and ribosomes/ribosomal subunits contain zinc, suggesting a structural/functional role for this motif in the ribosome.\",\n      \"method\": \"cDNA sequencing, amino acid sequencing, Southern blot (gene copy number), zinc detection in ribosomes\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein characterization and structural motif identification, single study\",\n      \"pmids\": [\"8441676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1976,\n      \"finding\": \"RPS27 (S27) was isolated as a distinct protein component of the rat liver 40S ribosomal subunit, establishing its identity as an integral ribosomal protein with defined molecular weight.\",\n      \"method\": \"Ion exchange chromatography, gel filtration, SDS-PAGE, amino acid composition analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct biochemical purification and characterization from native ribosomes\",\n      \"pmids\": [\"947902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Loss-of-function frameshift deletion in RPS27 identified in Diamond-Blackfan anaemia patients; in vitro knockdown of RPS27 disturbed pre-ribosomal RNA processing, and zebrafish rps27 morphants showed impaired erythrocyte production and developmental defects, establishing RPS27 as required for pre-rRNA processing and erythropoiesis.\",\n      \"method\": \"Whole-exome sequencing, in vitro siRNA knockdown with pre-rRNA processing assay, zebrafish morpholino knockdown\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human genetics combined with in vitro mechanistic assay and in vivo vertebrate model, multiple orthogonal methods\",\n      \"pmids\": [\"25424902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"A recurrent hotspot mutation in the 5'UTR of RPS27 found in ~10% of melanomas expands the 5'TOP (terminal oligopyrimidine) element, a motif that regulates expression of ribosomal protein transcripts in a growth-dependent manner, potentially sensitizing the mutated RPS27 transcript to translational regulation.\",\n      \"method\": \"Collated exome sequencing, 5'UTR sequence analysis, 5'TOP motif characterization\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — sequence/bioinformatic analysis of mutation effect on regulatory element; no direct functional assay of translational output\",\n      \"pmids\": [\"24913145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Two evolutionarily distinct S27 ribosomal protein isoforms exist in rats with differential mRNA expression patterns in the brain, particularly in hypothalamic nuclei, suggesting auxiliary (extraribosomal) functions beyond protein synthesis.\",\n      \"method\": \"In situ hybridization, cDNA cloning, GenBank database analysis, tissue expression profiling\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — localization data without direct functional mechanistic follow-up; single study\",\n      \"pmids\": [\"10820185\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RPS27 is an integral 40S ribosomal subunit protein bearing a zinc finger-like motif that is required for pre-rRNA processing; outside the ribosome it binds the central acidic domain of MDM2, competes with p53 for MDM2 binding, inhibits MDM2-mediated p53 ubiquitination, and thereby stabilizes p53, while its own expression is transcriptionally repressed by p53, creating a regulatory feedback loop within the p53-MDM2 axis.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nLooking at the corpus, I need to classify papers as KEEP (about RPS27, the ribosomal protein S27) or EXCLUDE.\n\n**Classification:**\n- Papers [1]-[28] in main corpus (MPS1/TTK kinase papers): EXCLUDE — these are about MPS1/TTK kinase (monopolar spindle 1), not RPS27. Despite \"MPS1\" appearing, this is a completely different gene (TTK kinase). RPS27 is a ribosomal protein.\n- Paper [29] (Arabidopsis ARS27A): EXCLUDE — plant ortholog with context incompatible (mRNA degradation after UV, tumor-like structures); however, this could be considered relevant to extraribosomal function. Actually, this is an Arabidopsis ribosomal protein S27 ortholog — the cellular context (ribosomal protein, DNA damage response) is compatible. KEEP.\n- Paper [31] (RPL27/RPS27 in Diamond-Blackfan anaemia): KEEP — directly about human RPS27.\n- Paper [35] (Zinc finger motifs in rat S27 and S29): KEEP — directly about rat ribosomal protein S27.\n- Paper [36] (Isolation of 40S proteins including S27): KEEP — directly about rat S27 protein.\n- Paper [46] (Isolation of additional 40S proteins including S27'): KEEP — about rat S27'.\n- Paper [19] (RPS27L and RPS27 interplay with p53-MDM2): KEEP — directly about human RPS27.\n- Paper [52] (RPS27L as p53-inducible modulator): KEEP — about RPS27L, but also mentions RPS27 context. Actually this is primarily about RPS27L, not RPS27. EXCLUDE (alias: RPS27L is a paralog, not RPS27 itself). Wait — the paper title says \"Ribosomal protein S27-like\" — this is RPS27L, a different gene. EXCLUDE unless it contains mechanistic findings about RPS27 itself. Reviewing: it's about RPS27L primarily. EXCLUDE.\n- Paper [60] (RPS27L as physiological regulator of p53): EXCLUDE — about RPS27L paralog.\n- Paper [68] (RPS27 5'UTR mutation in melanoma): KEEP — directly about RPS27.\n- Paper [84] (RPS27L regulates autophagy): EXCLUDE — about RPS27L.\n- Paper [96] (RPS27 in glioma): KEEP — directly about RPS27.\n- Paper [97] (Evolutionarily distinct classes of S27): KEEP — about rat S27 ribosomal proteins.\n- Paper [99] (MjRPS27 in shrimp): KEEP — shrimp RPS27 ortholog with mechanistic findings about antiviral function. KEEP as ortholog study.\n- Paper [41], [66], [69], [70], [85], [86], [87]: EXCLUDE — unrelated organisms/genes (bacteria, Arabidopsis plant-specific coiled-coil, Streptomyces enzymes, MPS1 corneal blindness = mucopolysaccharidosis type 1).\n\n**Additional gene2pubmed papers:**\n- [12] (Human and Drosophila 80S ribosome structures): KEEP — structural data placing S27 in ribosome.\n- [24] (Structure and evolution of mammalian ribosomal proteins): KEEP — includes S27 structural/evolutionary data.\n- Others: large-scale proteomics/interactome papers — these mention RPS27 incidentally. EXCLUDE from mechanistic discoveries unless specific.\n- [26] (RPS15 phosphorylation by LRRK2): EXCLUDE — about RPS15, not RPS27.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1976,\n      \"finding\": \"RPS27 (S27) was isolated as a component of the rat liver 40S ribosomal subunit; its molecular weight was estimated by polyacrylamide gel electrophoresis in SDS, and amino acid composition was determined, establishing it as a bona fide small-subunit ribosomal protein.\",\n      \"method\": \"Ion-exchange chromatography (carboxymethylcellulose), gel filtration (Sephadex G-75), SDS-PAGE, amino acid composition analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct biochemical purification and characterization of the protein from ribosomes\",\n      \"pmids\": [\"947902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"Rat ribosomal protein S27 contains 83 amino acids (MW 9,339 Da) and harbors a zinc finger-like motif, suggesting a structural role involving metal coordination; 4–6 gene copies were detected in the genome and the mRNA is ~620 nucleotides long.\",\n      \"method\": \"cDNA cloning and sequencing, amino acid sequencing of purified protein, Southern hybridization for gene copy number\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — primary structure determined by orthogonal cDNA and protein sequencing with structural motif identification\",\n      \"pmids\": [\"8441676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Mammalian RPS27 is characterized by a zinc finger domain among its structural motifs; the protein is conserved across eukaryotes and its mRNA contains features typical of ribosomal protein transcripts (5' TOP element).\",\n      \"method\": \"Comparative sequence analysis of 75 rat ribosomal proteins, identification of conserved motifs\",\n      \"journal\": \"Biochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — comparative/structural analysis without direct functional mutagenesis\",\n      \"pmids\": [\"8722009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Human RPS27 binds to MDM2 via its N-terminal region, interacting with the central acidic domain of MDM2; RPS27 forms an in vivo triplex complex with MDM2 and p53, competing with p53 for MDM2 binding. Ectopic RPS27 expression inhibits MDM2-mediated p53 ubiquitination and increases p53 protein levels by extending its half-life.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, ubiquitination assays, pulse-chase (half-life measurement), siRNA knockdown, ectopic expression\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with domain mapping plus functional ubiquitination and half-life assays in multiple cell contexts\",\n      \"pmids\": [\"21170087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Unlike RPS27L, RPS27 is a p53-repressible (not inducible) target gene; RPS27 protein is not a substrate of MDM2 (in contrast to RPS27L) and is not short-lived, indicating divergent regulation despite shared MDM2-binding capacity.\",\n      \"method\": \"Promoter-reporter assays, immunoblot after p53 activation, protein stability assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct experimental comparison with functional controls in the same study\",\n      \"pmids\": [\"21170087\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Cryo-EM structures of the human 80S ribosome placed RPS27 within the small (40S) ribosomal subunit, revealing its position and contribution to the metazoan-specific structural layers of the ribosome.\",\n      \"method\": \"High-resolution cryo-electron microscopy\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — cryo-EM structural determination of the intact human ribosome at high resolution\",\n      \"pmids\": [\"23636399\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"A frameshift deletion in RPS27 was identified in a Diamond-Blackfan anaemia (DBA) patient; in vitro knockdown of RPS27 disturbed pre-ribosomal RNA processing, and a zebrafish rps27 morpholino model showed impaired erythrocyte production and developmental defects, establishing RPS27 haploinsufficiency as causative for DBA through ribosome biogenesis failure.\",\n      \"method\": \"Whole-exome sequencing, in vitro siRNA knockdown with pre-rRNA processing analysis (Northern/qRT-PCR), zebrafish morpholino knockdown with erythrocyte staining\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function in two independent model systems (human cells + zebrafish) with defined molecular (rRNA processing) and cellular (erythropoiesis) phenotypes\",\n      \"pmids\": [\"25424902\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"A recurrent somatic hotspot mutation in the 5' UTR of RPS27 was identified in ~10% of melanoma samples; the mutation expands the 5' terminal oligopyrimidine (5'TOP) element, a motif that regulates expression of ribosomal protein mRNAs in response to growth signals, potentially sensitizing RPS27 transcript abundance to mitogenic regulation.\",\n      \"method\": \"Collation of exome sequencing datasets from independent melanoma cohorts, 5'TOP motif analysis\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — genomic discovery with mechanistic inference from known 5'TOP biology; no direct functional reconstitution of the regulatory effect\",\n      \"pmids\": [\"24913145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Shrimp (Marsupenaeus japonicus) RPS27 (MjRPS27) activates the NF-κB pathway (promoting nuclear translocation of Dorsal and Relish and expression of antimicrobial peptides) in response to white spot syndrome virus (WSSV) infection; MjRPS27 also directly interacts with WSSV envelope proteins VP19, VP24, and VP28, inhibiting virion assembly. Knockdown increased viral replication; overexpression reduced it.\",\n      \"method\": \"RNA interference knockdown, overexpression, co-immunoprecipitation (RPS27 with viral envelope proteins), nuclear translocation assays, survival assay in vivo\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus gain- and loss-of-function in vivo with defined pathway (NF-κB) and molecular (virion assembly) readouts; invertebrate ortholog\",\n      \"pmids\": [\"31921103\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RPS27 is an 83-amino-acid zinc-finger-containing protein of the 40S ribosomal subunit whose primary structural role in translation is established by purification and cryo-EM; extraribosomally, RPS27 binds the central acidic domain of MDM2, competes with p53 for MDM2 binding, inhibits MDM2-mediated p53 ubiquitination and thereby stabilizes p53, while itself being a p53-repressible (not inducible) gene and not a MDM2 substrate; loss-of-function mutations in RPS27 disrupt pre-rRNA processing and cause Diamond-Blackfan anaemia with erythropoietic failure, and recurrent 5'UTR mutations expanding the 5'TOP element are found in melanoma.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"RPS27 is a small zinc finger-containing protein of the 40S ribosomal subunit that functions in pre-rRNA processing and ribosome biogenesis, and its loss causes Diamond-Blackfan anaemia [PMID:25424902, PMID:8441676, PMID:947902]. Outside the ribosome, RPS27 binds the central acidic domain of MDM2 via its N-terminal region, competes with p53 for MDM2 binding, and inhibits MDM2-mediated p53 ubiquitination, thereby extending p53 half-life; p53 in turn transcriptionally represses RPS27, forming a negative-feedback loop within the ribosomal stress–p53 pathway [PMID:21170087]. Loss-of-function mutations in RPS27 impair pre-ribosomal RNA processing and erythropoiesis, establishing it as a causative gene for Diamond-Blackfan anaemia [PMID:25424902].\",\n  \"teleology\": [\n    {\n      \"year\": 1976,\n      \"claim\": \"Establishing RPS27 as a bona fide 40S ribosomal subunit component resolved the protein inventory of the small subunit and set the stage for functional studies.\",\n      \"evidence\": \"Ion exchange chromatography, gel filtration, and SDS-PAGE of rat liver 40S subunit proteins\",\n      \"pmids\": [\"947902\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No functional role assigned; purely compositional identification\",\n        \"Molecular interactions with rRNA or other ribosomal proteins not mapped\"\n      ]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Identification of a zinc finger-like motif in RPS27 and detection of zinc in ribosomes suggested a structural or functional role for metal coordination within the small subunit, distinguishing RPS27 from most other ribosomal proteins.\",\n      \"evidence\": \"cDNA and amino acid sequencing of rat S27 combined with zinc detection in purified ribosomes\",\n      \"pmids\": [\"8441676\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No mutagenesis of the zinc finger to test its necessity for ribosome function\",\n        \"Whether zinc coordination is essential for RPS27 incorporation into the ribosome was not tested\"\n      ]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Discovery of two evolutionarily distinct S27 isoforms with differential brain expression raised the possibility of tissue-specific extraribosomal functions, though no mechanism was demonstrated.\",\n      \"evidence\": \"In situ hybridization and cDNA cloning in rat brain tissue\",\n      \"pmids\": [\"10820185\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No direct functional assay for either isoform; expression data only\",\n        \"Whether the isoforms are interchangeable in the ribosome is unknown\",\n        \"Findings limited to rat; human relevance not tested\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrating that RPS27 binds MDM2, inhibits MDM2-mediated p53 ubiquitination, and is itself transcriptionally repressed by p53 revealed a ribosomal protein–MDM2–p53 feedback loop, linking ribosome status to cell-fate decisions.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation, MDM2-domain mapping, in vivo ubiquitination assay, pulse-chase half-life measurement, and siRNA knockdown in human cells\",\n      \"pmids\": [\"21170087\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether endogenous free RPS27 reaches sufficient levels to regulate MDM2 under physiological ribosomal stress is unclear\",\n        \"Structural basis of the RPS27–MDM2 interaction not determined\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of loss-of-function RPS27 mutations in Diamond-Blackfan anaemia patients, combined with knockdown studies showing impaired pre-rRNA processing and erythropoiesis, established RPS27 as essential for ribosome biogenesis and red blood cell development.\",\n      \"evidence\": \"Whole-exome sequencing of DBA families, siRNA knockdown with pre-rRNA northern blot analysis, and zebrafish morpholino phenotyping\",\n      \"pmids\": [\"25424902\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Precise step of pre-rRNA processing blocked by RPS27 loss not defined\",\n        \"Whether the DBA phenotype is mediated by p53 stabilization downstream of ribosomal stress was not directly tested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how the zinc finger motif contributes to RPS27's ribosomal versus extraribosomal functions, what the structural basis of the RPS27–MDM2 interface is, and whether the recurrent 5'UTR mutations in melanoma functionally alter RPS27 protein levels.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No structure of the RPS27–MDM2 complex\",\n        \"No functional assay linking 5'UTR melanoma mutations to altered RPS27 translation\",\n        \"Zinc finger mutagenesis effects on ribosome incorporation and p53 regulation untested\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [\n      \"40S ribosomal subunit\"\n    ],\n    \"partners\": [\n      \"MDM2\",\n      \"TP53\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"RPS27 (eS27) is a zinc-finger-containing structural component of the eukaryotic 40S ribosomal subunit that participates in both canonical translation and extraribosomal regulation of the p53–MDM2 axis. The 83-amino-acid protein was purified from mammalian ribosomes, shown to harbor a zinc-finger motif, and positioned within the metazoan small subunit by cryo-EM [PMID:947902, PMID:8441676, PMID:23636399]. Extraribosomally, RPS27 binds the central acidic domain of MDM2, competes with p53 for MDM2 binding, and inhibits MDM2-mediated p53 ubiquitination, thereby stabilizing p53, while itself being a p53-repressible (not p53-inducible) gene that is not a substrate of MDM2 [PMID:21170087]. Loss-of-function mutations in RPS27 impair pre-rRNA processing and cause Diamond–Blackfan anaemia through defective ribosome biogenesis and erythropoietic failure [PMID:25424902].\",\n  \"teleology\": [\n    {\n      \"year\": 1976,\n      \"claim\": \"Establishing RPS27 as a bona fide 40S ribosomal subunit protein resolved its identity among the dozens of small-subunit components and provided the first biochemical characterization.\",\n      \"evidence\": \"Ion-exchange chromatography, gel filtration, SDS-PAGE, and amino acid composition analysis of rat liver 40S ribosomes\",\n      \"pmids\": [\"947902\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No primary sequence or gene structure available\", \"No functional role beyond structural membership inferred\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Determination of the full 83-amino-acid sequence revealed a zinc-finger-like motif, suggesting RPS27 has a metal-coordinating structural element unusual among ribosomal proteins, and the presence of a 5'TOP element placed its mRNA under growth-dependent translational control.\",\n      \"evidence\": \"cDNA cloning/sequencing, protein sequencing, and Southern blot of rat RPS27\",\n      \"pmids\": [\"8441676\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No direct evidence that the zinc finger is functionally required\", \"No mutagenesis of the 5'TOP element to confirm translational regulation\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identifying RPS27 as a direct MDM2 interactor that stabilizes p53 by blocking MDM2-mediated ubiquitination established an extraribosomal tumor-suppressive function and connected ribosomal stress sensing to the p53 pathway.\",\n      \"evidence\": \"Co-immunoprecipitation with domain mapping, ubiquitination assays, pulse-chase half-life experiments, and siRNA/ectopic expression in human cell lines\",\n      \"pmids\": [\"21170087\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vivo demonstration of the MDM2–RPS27 axis in tumorigenesis\", \"Crystal structure of the RPS27–MDM2 interface not resolved\", \"Quantitative stoichiometry of free versus ribosome-bound RPS27 unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Cryo-EM placement of RPS27 within the human 80S ribosome provided the first structural context for its position in the small subunit and its contribution to metazoan-specific ribosomal architecture.\",\n      \"evidence\": \"High-resolution cryo-EM of the human 80S ribosome\",\n      \"pmids\": [\"23636399\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution contacts of RPS27 with rRNA and neighboring proteins not fully detailed\", \"Role in translational fidelity or decoding not addressed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of a causative RPS27 frameshift in Diamond–Blackfan anaemia, supported by pre-rRNA processing defects in knockdown cells and erythropoietic failure in zebrafish, established RPS27 haploinsufficiency as a ribosomopathy mechanism.\",\n      \"evidence\": \"Whole-exome sequencing of DBA patients, siRNA knockdown with Northern blot/qRT-PCR for pre-rRNA intermediates, zebrafish morpholino with erythrocyte staining\",\n      \"pmids\": [\"25424902\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise step(s) in pre-rRNA processing that require RPS27 not delineated\", \"Whether p53 pathway activation mediates the erythroid-selective phenotype not tested in this model\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Discovery of recurrent somatic 5'UTR hotspot mutations extending the 5'TOP element in ~10% of melanomas suggested that altered translational control of RPS27 abundance contributes to oncogenesis, though direct functional proof was lacking.\",\n      \"evidence\": \"Collation of independent melanoma exome sequencing datasets with 5'TOP motif analysis\",\n      \"pmids\": [\"24913145\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No reporter or ribosome profiling assay demonstrating altered translational output from the mutant 5'TOP\", \"Downstream consequence on ribosome stoichiometry or p53 regulation not tested\", \"Single genomic discovery without functional reconstitution\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: (1) the structural basis of the RPS27–MDM2 interaction at atomic resolution, (2) whether the zinc-finger motif has a specific rRNA-binding or extraribosomal function, (3) the precise step in pre-rRNA processing that depends on RPS27, and (4) the functional impact of melanoma 5'UTR mutations on RPS27 translation and p53 signaling.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution structure of RPS27–MDM2 complex\", \"Zinc-finger mutagenesis studies\", \"Mechanistic link between 5'UTR mutations and melanoma biology\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 5, 6]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [6, 7]}\n    ],\n    \"complexes\": [\n      \"40S ribosomal subunit\",\n      \"80S ribosome\"\n    ],\n    \"partners\": [\n      \"MDM2\",\n      \"TP53\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}